Displaying 20 results from an estimated 20000 matches similar to: "Calculate mean/var by ID"
2009 Jul 21
4
how to transform m/d/yyyy to yyyymmdd?
Hello,
I have a set of data that has a Date column looks like this:
12/9/2007
12/16/2007
1/1/2008
1/3/2008
1/12/2008
etc.
I'd like the date to look something like the follow (so that I could sort by
date easily).
20071209
20071216
20080101
20080103
20080112
How to do it? Thank you very much
Julia
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2008 Oct 10
4
how to store lme/lmer fit result
Dear R users,
I am building a hierarchical model on a large data set. It can take quite
some time to finish one fit, I was just wondering whether it is possible to
store the fit object (the result) to a file for later (offline) analysis.
thanks
Julia
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2009 Jun 17
3
how to read in only some columns of a data file
Hello,
I have a data file (.csv) that has a size of about 2.6 GB. I am not able to
read in the whole data set because of the memory limit. I actually only need
some columns (3 columns) of the data set, is there a way to read in
specified columns?
I am using windows.
Thanks,
Julia
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2009 Jun 01
2
how to checking whether elements of a vector changed or not.
Hello,
I have a vector:
x <- c("A", "A", "A", "B", "A", "A", "C")
I'd like to compare each of elements of vector x from its previous element
(except for the 1st element which does not have previous element). So I'd
like to get a vector y (of same length) that looks something like
(0, 0, 0, 1, 1, 0, 1) or
(F, F, F,
2009 Jan 12
3
roll weekly data to monthly level
Dear R users:
I have a data set that looks something like this:
ID time y
1 2/01/2008 4
1 2/09/2008 12
1 9/01/2008 8
2 1/06/2008 3
2 3/01/2008 4
2 3/09/2008 9
2 6/03/2008 4
3 1/02/2008 3
3 1/10/2008 8
3 2/02/2008 7
3 2/10/2008 3
I'd like to sum up the weekly data to the monthly level, so that it looks
something
2008 Sep 30
1
Adding legends to a plot
Hello,
I have a time series plot drawn using 3 different colored lines, each line
corresponds to different category group. I'd like to put legends on the
plot. I am using "legend" to do this, however, I can either specify lty or
col in legend. Will I be able to do the following in the legend box: a solid
black line then g1, a solid red line then g2, a solid blue line then g3?
2009 Feb 11
3
two scatter plots in one
Dear R users,
I need to compare two scatter plots,
plot(x1, y1)
plot(x2, y2)
and would like to plot them in the same figure. How do I do it?
Thank you.
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2008 Oct 30
1
How to increase iteration limit for lmer()?
Dear R users:
I am running lmer(), and I had the following warning message:
"In mer_finalize(ans): iteration limit reached without convergence (9)
What is the default limit for lmer()? And how do I increase the limit?
Many thanks,
Julia
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2009 Jul 31
1
how to calculate time interval between dates
Dear R users:
I have a vector of dates as follows:
t <- c("2007-01-05", "2007-05-14", "2007-12-28", "2008-01-09", "2008-04-24",
"2009-02-14")
I'd like to calculate number of days between those dates (time interval).
How to do it?
Thank you,
Julia
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2008 Oct 16
1
increase memory limit in R
Dear R users,
I am running lmer() and having memory problem: "reached total allocation of
1535Mb".
The lmer() function was successful (no errors or warnings). However when I
do "summary(fit.lmer), I got this "Error: cannot allocate vector of size
19.5 Mb). I used memory.size() and got 1880. I used memory.limit(2500) to
increase the memory size to 2500Mb, however I still get
2009 May 29
1
frequence of patterns in a vector
Dear R users,
Suppose I have a vector that consists of characters like ABC, A02, RCA,
etc., and there are about 700 of possible characters. For example,
x <- c("ABC", "ABC", "ABC", "A02", "ABC", "RCA", "ABC", "ABC")
I'd like to get a frequency matrix that looks something like this:
ABC 6
A02 1
RCA 1
I
2009 Sep 24
1
multinormial runs tests?
Dear R users,
I would like to test the randomness in a series of N values (N>=2). I know
that runs.test works for dichotomous factor only:
x <- rep(c(1,2), 50)
runs.test(factor(x))
However it doesn't work for series that can take any N values (N>2):
x <- rep(c(1,2,5,4),50)
runs.test(factor(x))
Error in runs.test(factor(x)) : x does not contain dichotomous data
Are there any R
2023 Oct 24
2
How to Calculate the Mean by Multiple Groups in R
Hello,
I have a data frame with different groups (Time, Target, Conc) and
each entry has a triplicate value of the measurements OD and ODnorm.
How can I merge the triplicates into a single mean value?
I tried the following:
```
df = data.frame(Time=rep(1, 9), Well=paste("A", 1:9, sep=""),
OD=c(666, 815, 815, 702, 739, 795, 657, 705, 663),
2017 Mar 11
2
What does it mean by a "DICompileUnit missing from llvm.dgs.cu" ? | Where is the error ?
Hello,
One of my Julia programs failed to execute with the following error,
DICompileUnit not listed in llvm.dbg.cu
!11 = distinct !DICompileUnit(language: DW_LANG_C89, file: !3, producer:
"julia", isOptimized: true, runtimeVersion: 0,emissionKind: FullDebug, enums
: !12)
This was generated by verifyModule(*GPUModule,&(llvm::errs())From whithin
PPCGCodeGeneration.cpp in Polly.
2023 Oct 24
2
How to Calculate the Mean by Multiple Groups in R
Hi,
I think you're misunderstanding which set of variables go on either
side of the formula.
Is this what you're looking for?
> aggregate(OD ~ Time + Target + Conc, data = df, FUN = "mean")
Time Target Conc OD
1 1 BACT 1 765.3333
2 1 BACT 2 745.3333
3 1 BACT 3 675.0000
> aggregate(ODnorm ~ Time + Target + Conc, data = df, FUN =
2023 Oct 24
1
How to Calculate the Mean by Multiple Groups in R
Also,
> aggregate(cbind(OD, ODnorm) ~ Time + Target + Conc, data = df, FUN = "mean")
Time Target Conc OD ODnorm
1 1 BACT 1 765.3333 108.33333
2 1 BACT 2 745.3333 88.33333
3 1 BACT 3 675.0000 18.00000
(You might wish for "cbind(OD,ODnorm) ~ . - Well", but aggregate.formula is not smart enough for that.)
-pd
> On 24 Oct 2023, at
2017 Nov 28
2
[PATCH] drm/nouveau/mmu: fix odd_ptr_err.cocci warnings (fwd)
This is a false positive, but I wonder if it is really necessary to put
the assignment in the conditional test expression.
julia
---------- Forwarded message ----------
Date: Tue, 28 Nov 2017 13:23:36 +0800
From: kbuild test robot <fengguang.wu at intel.com>
To: kbuild at 01.org
Cc: Julia Lawall <julia.lawall at lip6.fr>
Subject: [PATCH] drm/nouveau/mmu: fix odd_ptr_err.cocci
2010 Aug 17
2
Matrix
How do I completely remove the first column?
(x <- matrix(c(1, 44, 124, 80, 254, 70, 190, 0, 2, 35, 110, 70, 240, 73, 216, 0, 3, 41, 114, 80, 279, 68, 178, 0, 4, 31, 100, 80, 284, 68, 149, 0, 5, 61, 190, 110, 315, 68, 182, 1, 6, 61, 130, 88, 250, 70, 185, 0, 7, 44, 130, 94, 298, 68, 161, 0, 8, 58, 110, 74, 384, 67, 175, 0, 9, 52, 120, 80, 310, 66, 144, 0, 10, 52, 120, 80, 337, 67, 130, 0, 11,
2017 Mar 12
2
What does it mean by a "DICompileUnit missing from llvm.dgs.cu" ? | Where is the error ?
On Sat, Mar 11, 2017, at 07:34 PM, David Blaikie via llvm-dev wrote:
> On Sat, Mar 11, 2017 at 3:10 AM SANJAY SRIVALLABH SINGAPURAM via llvm-dev
> <
> llvm-dev at lists.llvm.org> wrote:
>
> > Hello,
> >
> > One of my Julia programs failed to execute with the following error,
> > DICompileUnit not listed in llvm.dbg.cu
> > !11 = distinct
2012 Feb 14
1
Calculate mean between to classes for each ID
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